Abstract: A method for forming a mouth guard and apparatus for anatomically conforming the impression material to a user's mouth and teeth. Polyvinyl siloxane base putty is combined in equal parts with polyvinyl siloxane catalyst putty until a uniform amalgam is formed by kneading and mixing. The mass is then formed into a roll of about three inches in length having a thicker center and extended and tapering ends with a one-inch diameter at the center and approximately half-inch diameters at the ends. A bite bar having a lateral handle is pressed through the center of the mass to form grasping means by which the putty-mass-and-bite-bar, or mouth-guard, assembly may be easily handled. A shield (that may have prongs) on the bite bar serves to support and obstruct the passage of the putty mass. Curving the putty mass about the shield and optional prongs serves to conform the putty mass to the anatomical curvature of a user's teeth.